This game is very good! I love the graphics, so cartoon-y and fun to look at! The gameplay is fun and interesting, it makes regularly easy platforming much more challenging. The music I like as well, but more sound effects could be used. After the jam, if you weren't going to already, maybe add a background. Some parallax scrolling and objects in the foreground can make the game have a bit more of an illusion of depth. Objects for the character to interact with in the foreground would look pretty good too, like grass that waved when brushed, or got pressed down by a jump. The game is simple, and fun. I love that.